Is it true that D800 only makes sense for landscape photographers and those who use it mostly in either good light or on a tripod?

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Cheers, Marin

No

I use my D-800e(s) for weddings and find it has great low-light performance (AF). A lot better than the D1x and D2x that I'm use to. Need to check your camera holding techniques if you cannot get a good photo using 85mm under 1/160. I have handheld my 70-200 down to 1/10 and gotten tack sharp images most of the time.

I shot the "River of Lights" here in Albuquerque in almost no light and just about 100% of the images are tack sharp and very low light and high ISO. No problem with focusing, no problem with low light performance.....this camera continues to blow me away on it's capablities.